Review Science Topics

Before the Science Day Exhibition you will review all four units from this year. This is your chance to check your understanding, fill in any gaps, and feel confident about everything you have learned.

Unit A — Living Things

• All living things show the same signs of life — they grow, eat, breathe, move, respond, and reproduce.
• Plants are producers: photosynthesis turns sunlight, water, and CO2 into sugar (food) and oxygen.
• Food chains flow from a producer to a primary consumer to a secondary consumer.
• Biodiversity is the variety of species; high biodiversity makes ecosystems more stable.

Unit B — Earth and Weather

• The water cycle: evaporation then condensation then precipitation then collection.
• Extreme weather: tornado (interior room), hurricane (evacuate coast), blizzard (stay indoors, keep warm).
• Weather is what happens day to day; climate is the pattern over many years.

Unit C — Matter and Energy

• Matter has three states: solid (fixed shape), liquid (takes its container), gas (spreads out).
• Heating and cooling change state: ice then water then water vapor.
• Sound is made by vibrations that travel as pressure waves to our ears.
• Magnets attract iron, nickel, and cobalt; opposite poles attract, like poles repel.

Unit D — Human Body and Health

• The heart pumps blood: right side then lungs then left side then body — in a continuous loop.
• A balanced plate: half grains and vegetables, one quarter protein, one quarter dairy.
• Sleep repairs muscles, stores memories, produces immune cells, and restores energy.
• Good hygiene — handwashing, brushing teeth, flossing — keeps germs from making you sick.